General Information
    • ISSN: 2010-0221
    • Frequency: Bimonthly
    • DOI: 10.18178/IJCEA
    • Editor-in-Chief: Dr. Eldin W. C. Lim
    • Executive Editor: Mr. Ron C. Wu
    • Abstracting/ Indexing: Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, CABI, DOAJ, Electronic Journals Library, Google Scholar, Engineering & Technology Digital Library, ProQuest, and Crossref
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Editor-in-chief
Dr. Eldin W. C. Lim
Dept. of Chemical and Biomolecular Engineering,
National University of Singapore, Singapore
IJCEA 2017 Vol.8(4): 294-298 ISSN: 2010-0221
doi: 10.18178/ijcea.2017.8.4.673

Rapid Semi-Quantitative Analysis of Formaldehyde in Food by Digital Image Colorimetry

Jinda Rungroadsri, Wadcharawadee Limsakul, Worawit Wongniramaikul, and Aree Choodum
Abstract—Digital image colorimetry was successfully applied for the rapid semi-quantitative analysis of formalin in fresh food. A built-in digital camera in mobile phone was used to image a colorimetric product of formaldehyde, while a custom-built color analysis program was used to analyze the color intensity of the digital image. A colorimetric product (yellow) was obtained from the colorimetric reaction between the colorimetric reagents entrapped within a custom-built sensor and formaldehyde. A wide linear range (1 to 50 mg/L) with good linearity (>0.99) was obtained for formaldehyde quantification. Good inter-day precision (1.30-4.37%RSD) with low detection limit (0.016 mg/L) were obtained. The method was applied for semi-quantitative analysis of formaldehyde in fresh foods from fresh markets in Phuket. The concentrations of formaldehyde in the foods were lower than their natural occurrence.

Index Terms—Digital image colorimetry, formaldehyde, mobile phone, colorimetric sensor.

The authors are with the Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Phuket, 83120 Thailand (e-mail: wadcharawadee.n@phuket.psu.ac.th, worawit.won@phuket.psu.ac.th, aree.c@phuket.psu.ac.th, jinda.r@phuket.psu.ac.th).

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Cite: Jinda Rungroadsri, Wadcharawadee Limsakul, Worawit Wongniramaikul, and Aree Choodum, "Rapid Semi-Quantitative Analysis of Formaldehyde in Food by Digital Image Colorimetry," International Journal of Chemical Engineering and Applications vol. 8, no. 4, pp. 294-298, 2017.

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